Remark 4.13 
Similarly to Remark REF , the result in Proposition REF 
is stronger than the isomorphisms that can be obtained by using the
general theory of 2-cocycle deformations from [1]}, [2]} and [3]}.
Concretely, the property that \(\alpha \)  is unchanged by the isomorphism
\(\omega ^0_\theta + \alpha \mapsto \omega ^0 + \alpha \)  is a
particular feature of the example under investigation.

